An optical cable protector comprises a cylindrical casing, wherein, a side electrode mounting hole is formed in the center of the bottom part of the casing, a side electrode is arranged in the side electrode mounting hole, and the side electrode is fixed at the bottom part of the casing through a nut. A center electrode mounting hole is formed on the cylinder wall of the casing, a center electrode is arranged in the center electrode mounting hole, and the center electrode is fixed on the cylinder wall of the casing through a nut. An end cover is arranged at the open end of the casing and is in threaded connection with the casing, a side electrode mounting hole is formed in the center of the end cover, a side electrode is arranged in the side electrode mounting hole, and the side electrode is fixed with the end cover through a nut. Inside the inner chamber of the casing, the distance between the semispherical cambered surface of each side electrode between the spherical cambered surface of the center electrode ranges from 0.2 to 1.5 mm; and each side electrode is further equipped with two flat washers, a spring gasket and a nut, and the center electrode is further equipped with two flat washers, a spring gasket and a nut.